I'm planning on getting out of dodge for a few days/week this summer and I'm looking for places to go and things to do. It'll be me and a buddy for sure, possibly a few other people as well. We are open to most anything. Ideas tossed around are camping/hiking in Colorado/Montana/that general area. Going to Boston or even swinging down through St. Louis and crusing through Memphis, Nashville, the Great Smokies etc.

What I'm wondering is are what are some cool things that you people can recommend checking out? It doesn't have to be in the areas that I suggested, although due to where we live (Green Bay, Wi) the west and SE Coasts are out. As an example of "stuff to check out" each summer Milwaukee has "Summerfest" which bills itself as the worlds largest outdoor music festival.